Cutter holder for stone dressers and the like



Paul Wyncmd 2 4 G nu. l I F f//W F I3 m m Feb. 3, 1953 P. wEYNAND CUTTER HOLDER F'OR STONE DRESSEVRS AND THE LIKE Original Filed April 22, 1947 FIG. l

Patented Feb. 3, 1953 UNITED STATES PATENT OFFICE CUTTER HOLDER FOR STONE DEESSERS AND THE LIKE Paul Weynand, San Antonio, Tex.

2 Claims.

This invention relates to cutter'holders for stone dressing machines and the like, and is a division of my application for United States Patent, Serial No. 743,079, filed April 22, 1947,'for Improvements in Stone Dressers, and which'has matured into Patent 2,471,991, dated May 31, 1949.

An important object of the invention is to provide cutter holders for the conventional cutters, having cylindrical shank portions, which holders are so constructed and arranged that they will prevent accidental rotation of the cutters during use of the latter.

Another important object is to provide, in Aa cutter holder, manually rotatable cutter-holding means which means will not be apt to become jarred into rotation due to vibrations" of the dressing machine with which it is associated.

A further important object is to provide a cutter holder which will retain the cutter in a fixed s or set position irrespective of the distance the cutter point projects outwardly of the dressing bar.

Other objects and advantages of the invention will be apparent during the course of the following detailed description of the invention, taken in connection with the accompanying drawings, forming a part of this disclosure, and i'n which drawings:

Fig. 1 is a view, mostly in vertical section of the novel cutter holder, with a cutter in elevaL tion.

Fig. 2 is a vertical section, substantially on the line 2`-2 of Fig. l.

Fig. 3 is a horizontal section, substantially on the line 3-3 of Fig. 2.

Fig. 4 is an elevation of the novel cutter holder, carrying a cutter in position to engagea stone, a fragment of which is shown in section.

In the drawing, wherein for the purpose of illustration is shown a preferred embodiment of the invention, and wherein similar reference characters designate corresponding parts thruout the several views, the letter A designates a cutter device; B, the new cutter device holder; and C a pilot assembly.

The cutter device A is of conventional construction and comprises a screw-threaded shank 5 havin-g a suitable cutter element 5 as a diamond point) at one end and a head l at its other end.

The cutter device holder B includes an interiorly screw-threaded, split sleeve i surrounding the intermediate portion of the shank and extending into a suitable opening II extending transversely through an elongated dressing b'ai- 2 I2. This opening II preferably extends with its axis forming obtuse angles with the adjacent faces of the dressing bar I2, and its axis is inclined from the longitudinal axis of the dressing bar, as shown in Fig. 1. Consequently the longitudinal axis of the shank 5 is also inclined with respect to the longitudinal axis of the dressing bar I2. A set screw I3 may be employed to assist in securing the split sleeve `I0 in place and tends to compress it, since, as in Fig. 2, it bears against the outer periphery of the split sleeve at a location substantially from the contact of the cam surface with the split sleeve, so that as the set screw presses the split sleeve toward the cam surface, the cam surface forces the split sleeve toward the free end of the set screw. Associated with the split sleeve I0 is a major locking device I4, comprising a shank I5, screw-threaded at one end and to which a knurled nut I6 is secured by means of the screw threads. The free end por# tion I1 ofthe shank I5 is enlarged over the intermediate portion of the shank with the enlarged end providing a cam surface I8 at the juncture of this end portion I1 and the intermediate portion of the shank. The shank I5 is constructed and arranged to be inserted into a suitable bore or second opening I9v in the dressing bar, spaced above the opening I I and with its axis normal to the axis of the opening II. This insertion. may be m-ade, since the nut I5 is removable. This nut bears against a block` 20 vwhich has a bore for the shank I5 and a substantially V-shaped slot ZI in the faceoppositeits nut-contacting face, with the slot accommodating an edge portion of the dressing bar as may be seen in Fig. 3. As the shank is drawn to the right in Fig. 3, upon tight* ening of the nut the cam surface IB bears against the sleeve I0, as is clear in Fig. 2, and causes tightening of the sleeve I9 and prevents longitudinal movement thereof. Obviously manual rotation of the head I will feed the cutter element 6 (diamond point) tow-ard or away from the dressing bar I2.

The pilot assembly C is fully illustrated and described in my United States Patents No. 2,387,787 dated October 30, 1945 and No. 2,443,489, dated June l5, 1948. It includes a pilot shaft 25 carrying a stone 26.

In inserting a cutter device Ain a holder B, the operator may unscrew the set screw I3 slightly so that the split sleeve It is not under compression, and also manipulate the major locking device I4 so that its cam surface I8 of the enlarged free end portion Il Will not interfere with the insertion of the cutter device A into the split sleeve I (that is, the cam surface will not engage the split sleeve). After the cutter device A is inserted, the set screw I 3 is tightened and this both prevents rotation of the split sleeve ID and also tends to tighten the latter about the shank 5 of the cutter device. Now, by feeding the-major locking device I4 so that the cam surface of the enlarged end portion I'i will move against the outer periphery of the split sleeve I9, there will be a pressure exerted thereon just vopposite the engagement of the shank of the set screw I3 with the split sleeve. r.he cutter device is now securely held against 4being accidentally jarred into rotation. However, upon relieving the pressure of the cam surface and slightly unscrewing the set screw I3, the cutter device may be manually rotated.

Various changes may be made to the form oi the invention herein shown and described without departing from the spirit of the invention or scope of the claims.

What is claimed is: n 1. In a stone dresser, a cutter device holding and locking means for a cutter device having a 4screw-threaded shank portion provided with a cutter, said means including an elongated dressing bar portion provided with a 'transverselyextending opening receiving a part of said shank portion and being of a circumference substantially greater than the circumference of said shank portion; an interiorly screw-threaded split sleeve with its screw threads in screw threaded engagement with a part of the screw threads of said shank portion and extending about the part of said shank portion within said opening, said dressing bar portion also having a second opening with its longitudinal axis substantially normal to the longitudinal axis of the rst-mentioned opening and with thev peripheries of the openings merging into each other at substantially the axial center of said dressing bar; a longitudinally slidable shank within said second opening with the central portion of the periphery of said shank having a cam surface extending into the first mentioned opening and constructed and arranged to compress said split sleeve when bearing against a part of the outer periphery of said split sleeve; means toselectively move said shank to cause said cam surface to move into and out of camming engagement Vwith said -split sleeve; and a set screw carried by said dressing bar with the free end of the shank of said set screw normally pressed against the outer periphery of said split sleeve ata location substantially 180 fromthe contact of said cam surface and outer periphery of said split sleeve, whereby as said set screw presses said sleeve toward said cam surface, said cam surface forces said sleeve toward the free end of said set screw. i Y

2. In a stone dresser, a cutter device holding and locking means for a cutter device having a screw-threaded shank portion provided with a cutter, said means including an elongated dressing bar portion provided with a transversely extending smooth-bored opening receiving a part of said-shank portion andbeing of a circumference substantially greater than the circumference of said shank portion; an interiorly screw- -threaded split sleeve with its screw threads in screw threaded engagement with a part oi the screw threads of said shank portion and extending about the part of said shank portion within said opening, said split sleeve having a smooth outer periphery slidable over the smooth surface of said opening, said dressing bar portion also having a second opening with its longitudinal axis substantially normal to the longitudinal axis of the first-mentioned opening and with the peripheries of the openings merging into each other at substantially the axial center of said dressing-bar; .a longitudinally. slidable shank within saidsecond opening with the central vpor,- tion of the periphery of said shank having a cam surface extending into the rst mentioned opening and constructed and arranged to compress said split sleeve when bearing against a part of Vthe outer periphery of said split sleeve; means to selectively move said shank to cause said cam surface to move into and out ci camming engagement with said split sleeve; and a set screw carried by said dressing bar with the free end of the shank of said set screw normally pressed against the outer periphery of said split sleeve at a location substantially from the contact of said cani surface and outer periphery of said split sleeve, whereby as said set screw presses 'said sleeve toward said cam surface, said cam surface forces said sleevetoward the free end of said set screw,

PAUL WEYNAND.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS 

